Ornamental zigzag stitching attachments with die cast frames



Aprll 1, 1958 l-jliii-i 113:1. (MST m ma Filed Dec. 3, 1956 5 Sheets-Sheet l INVENTOR. John P. Enos WITNESS ATTORNEY April 1, 1958 J P ENOS 2,828,705

ORNAMENTAL zIGz'AG .STITCHING ATTACHMENTS WITH DIE cAsT FRAMES Filed Dec. 3, 1956 3 Sheets-Sheet 2 IN V EN TOR.

John P. Enos WITNESS A T TORNE Y April 1, 1958 2,828,705

J. 'P. ENos ORNAMENTAL ZIGZAG sum-1 m; ATTACHMENTS wm-x DIE CAST FRAMES Filed Dec. 3, 1956 I 3 Sheets-Sheet 3 2' =':II 24 I Mir- "In" 99 "J a I 3 v 4| II I iqi; mu". I"

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g 5 llll v IN VEN TOR. John P. Enos WITNESS ATTORNEY ORNAMENTAL ZIGZAG STITCHING ATTACH- MENTS WITH DIE CAST FRAMES Application December 3, 1956, Serial No. 625,998

5 Claims. (Cl. 112-160) This invention relates to work-jogging attachments for sewing machines, and more particularly to pattern cam controlled work-jogging attachments in which any one of a plurality of selected pattern cams may be inserted into the attachment.

It is an object of this invention to provide an attachment of the above character which may be fabricated and assembled more quickly and more economically than has been heretofore possible.

It is also an object of this invention to provide a novel frame construction for a work-jogging attachment in which the operating parts of the attachment can be assembled in a manner such that the accumulation of tolerances between the parts will be of such a small amount as to insure the proper location of the workengaging foot of the attachment with respect to the needle of a sewing machine to which the attachment frame is secured Without special selection or adjustment of the parts.

With the above and other objects and advantages in view as will hereinafter appear, this invention comprises Fi 1 re resents a to lan view of a sewin machine work-jogging attachment having this invention applied thereto and in which the pattern cam cover is in opened 40 position, the attachment being mounted on the usual sewing machine presser-bar which is sectioned and the attachment driving lever embracing the usual needleclamp,

Fig. 2 represents an enlarged front elevational view of the attachment of Fig. 1 with the pattern cam cover closed,

Fig. 3 represents an enlarged rear elevational view of the attachment of Fig. l,

Fig. 4 represents an enlarged top plan view of the attachment of Fig. 1 with the pattern cam cover at its hinge being sectioned and with the pattern cam and an attachment cover plate removed,

Fig. 5 represents an enlarged bottom plan view of the attachment,

Fig. 6 represents a top plan view of the attachment frame with the bight adjusting slider pivoted thereto and turned into a position favorable to assembly of the actuating mechanism parts onto the frame,

Fig. 7 represents a top plan view of the work-jogging member and the anchor link therefor,

Fig. 8 represents a top plan view of the pattern cam actuating linkage, and

Fig. 9 represents a top plan view of the pattern cam accommodating ratchet wheel.

In the accompanying drawings this invention is illustrated as embodied in a Work-jogging attachment of the type disclosed in my co-pending patent application Serial No. 461,149, filed October 8, 1954, to which reference may be had for a more complete disclosure of a sewing machine attachment in which the work-jogging motion is derived by way of a pattern cam arranged such that tes Patent (7 ce Patented Apr. 1, 1958 the cam may be removed from the attachment and a different cam inserted without in any way disturbing the actuating mechanism of the attachment.

The attachment frame of this invention is formed as a molded one piece member indicated generally as 11 in the drawings and best illustrated in Fig. 6. The frame 11 is preferably made by a die casting process which provides a desirable surface finish, dimensional stability and uniformly high dimensional accuracy.

The frame member is formed with a flat substantially horizontally disposed platform 12 formed with an aperture 13 of which the forward extremity is elongated lengthwise of the attachment frame and formed adjacent the upper surface of the platform 12 with recessed shoulders 14. The rearward extremity of the aperture 13 is enlarged laterally as indicated at 15. Extending upwardly from the platform 12 are a pair of bearing lugs 16, 17 disposed one at each side of the aperture 13 and formed transversely with cylindrical bearing apertures 18 and 19 respectively. The bearing apertures 18 and 19 are coaxial and the aperture 19 side of the platform 12 is an upstanding reinforcing rib 26. An upstanding reinforcing rib 27 extends only part Way along the opposite side of the platform 12 and is joined to the rib 26 by a transversely extending rib 28 extending along the rear edge of the platform. The ribs 26, 27 and 28 provide sidewalls which with the platform 12 as a bottom define an upwardly open enclosure adapted to house the pattern cam of the attachment.

A hearing stud 29 formed with a shouldered base portion 30 is carried by the platform 12 of the frame and provides a vertical axis of turning movement of the pattern cam and of a portion of the pattern cam actuating mechanism. The bearing stud may be formed as an integral part of the one piece molded frame, or as illustrated in the drawings, the stud may be a separate element secured in place on the platform in an aperture 31 formed in the platform in much the same fashion as a rivet. The aperture 31 is preferably counterbored as at 32 beneath the platform so that the stud 29 will not project beneath the level of the platform 12. Within the enclosure provided by the platform sidewalls 26, 27 and 28, and at the junction of the sidewalls 26 and 28, the platform 12 is formed with a raised boss 33 (Figs. 4 and 6) formed with a tapped hole 34 adapted to accommodate an anchor link connection of the workjogging mechanism of the attachment as will be crescribed hereinbelow.

The first step in the assembly of parts into the one piece attachment frame 11 is illustrated in Fig. 6 and involves that of slidably pivoting a bight adjusting slider 35 to the frame. The slider 35 is formed with an elongated slot 36 entered by a rivet 37 which is set into an aperture 38 formed in the attachment frame platform 12, thereby slidably to pivot the bight adjuster beneath the frame. The bight adjusting slider is formed at one side with an upturned flange 39 from which projects a rearwardly and outwardly extending finger grip portion 41; The bight adjusting slider is also formed with a threaded aperture 42 which, in the completely assembled attachment, carries a fulcrum pin 43 slidably -a'rranged' 3 in. the: elongated portion 13 of the frame platform 12 with the head of the fulcrum pin being disposed in the recessed shoulders 14 of the elongated opening 13. The upturned flange39 of the slider is formed with an elongatedslot. 4 2- (Fig. 3) to accommodate a; knurledzclamp screw 65 threaded into the, frame. sidewall 26 and by which the slider 35 may be lockedto the frame to secure the'fulcrum pin-43 in any selected positionof adjustment along the frame aperture 13. The flange 39 may be marked with indicia 46 and the frame sidewall 26 with a pointer 47 to provide visual indication of the relative position of adjustment of the fulcrum pin.

With the rivet 37 set and before the fulcrum pin 43 and the'clamp screw 45 have been applied, the bight adjusting slider is slidably pivoted to the frame and may beturned as illustrated in Fig. 6 to expose the enlarged portion 15 of the frame platform opening for insertion of other parts of the attachment mechanism. The frame sidewall 26 is apertured as at 48 to accommodate the projecting finger grip 41 of the bight adjusting slider when the slider is turned during assembly of the attachment.

Fig. 8 illustrates the pattern cam actuating mechanism as it is preassembled prior to insertion into the attachment frame. The sub-assembly comprises a driving lever 49 which as illustrated in side elevation in Fig. 2 takes the form of a bell crank lever having a driven arm 51 bifur cated to embrace the conventional needle clamp 52 carried by the needle bar 53 of the sewing machine. The

driving lever 49 also is formed with a driving arm S4-pivotally secured to a connecting link 55. The driving lever 49 is fast on a fulcrum stud 56 formed with cylindrical bearing surfaces 57 and 58 adapted to be accommodated in bearing lug apertures 18 and 19 formed in the upstanding bearing lugs 16 and 17 of the attachment frame. Between the bearing surfaces 57 and 58 the fulcrum stud is formed with an annular recess 59 providing a seat for a spring clip 61 (Fig. 4) by which the fulcrum stud is maintained inplace in the upstanding bearing lugs 16 and 17. The connecting link 55 is secured by means of a pivot pin 62 to an oscillatory pawl carrier 63 formed with a bearing aperture 64 adapted to be accommodated on the cylindrical shouldered base 36 of the stud shaft 29 carried on the frame platform 12. Secured on the pawl carrier by means of a pivot pin 65 is a pawl 66 formed with an upturned tank 67 which is engaged by one arm of a wire coil spring 68 carried on the pivot pin 65 and anchored in a notched lug 69 struck up from the pawl carrier 63. A small bell crank lever 71 fulcrumed on the pivot pin 62 joining the pawl carrier to the connecting link 55 is disposed for engagement with the upturned tank 67 on the pawl 66 and provides a means for turning the pawl against theaction of the wire spring 68 into an ineffective or throw-out.

the fulcrum stud 56 into the bearing lug apertures 18and. 19, insertion of thespring clip 61 into the annularv recess 59 to lock the fulcrum stud against removal from the frame, and finally placing the bearing aperture 64 in the pawl carrier 63 over the cylindrical shouldered base 31 of the stud shaft 29 on the frame platform 12. Fig. 4 best illustrates the assembled position of this subassembly.

Fig. 9 illustrates a ratchet wheel 72 formed with a hub 73 adapted to be journaled on the stud shaft 29 carried on the frame platform 12. in assembly the ratchet wheel is simply placed on the stud shaft and rests upon the pawl carrier 63 in operative relation with the pawl 66. The ratchet wheel hub is formed with diametrically opposed notches 74-74 in order to accommodate a pattern cam as will be hereinafter described.

Fig. 7 is a view of the work-jogging member of the a tachment. A work engaging foot 75 formed with a. transversely elongated needle aperture 76 is formed at the downturned forward extremity of a shank member 77 which is slotted lengthwise as at 78 and formed at its rearward'extrernity with an upwardly olfset portion 79. In Fig. 3, the side elevational view is illustrated of the workjogging foot and of the shank member 77. Fixed in the upwardly offset portion 79 is an upwardly extending pin 81 on which an anchor link 82 is pivoted and a cam follower roller 83 is journaled.

In the third assembly step, the work-jogging member is positioned and secured on "the attachment frame. For purposes of inserting the work-jogging member, the bight adjusting slider 35 is turned to a position substantially at right angles to the attachment frame, as indicated in Fig. 6, to expose the enlarged portion 15 of the attachment platform aperture. The aperture 15 when exposed is sufficiently large to accommodate insertion of the anchor link 82. the cam. follower 83 and the upwardly offset portion 79. of the, shank member 77. The inserted linkage is then secured in place by a pivot screw 84 passing through the. anchor link and threaded'into the threaded hole 34 in the frame boss 33. The bight adjusting slider is then turned into the position illustrated in Figs. 1 tov 5 in whichthe slider underlies the shank 77 of the presserffoot and the. fulcrum pin 43 is inserted downwardly through the frame platform aperture 13, through the slot 78 in the shank 77,.andis threaded into the tapped hole 42in thebight adjusting slider. When secured in place by the anchor link pivot screw Maud the fulcrum pin 4-3,

.the offset. portion 79 of the presser shank overlies the ratchet wheel 72 and thus prevents removal of the rachet Whfifil or of the pawl carrier 63 from the stud shaft 29. The pivot pin 86, the fulcrum pin 43 and the spring clip 61 thus provide the sole fastening means maintaining all of the actuating mechanism of the attachment in place on the frame.

The above described work-jogging mechanism is particularly adapted for use with a pattern cam indicated generally as 85 in the drawings, which cam may be of the type described in my prior U. S. Patent application Serial No. 461,149 in that the cam may be shifted into or out of operative relationship with both the cam follower roller 83 and with the hub 73 of the ratchet wheel simultaneously. As illustrated in dashed lines in Fig. 5, the pattern cam is formed with a bore 86 complemental to the ratchet wheel hub and is formed in the bore with diametrically opposed lugs 87 37 adapted to enter the notches 74-74 in the ratchet wheel hub thus to provide a separableinterlocking connection therebetween. A cam groove 88 is formed in the pattern cam on the same side as the ratchet hub accommodating bore to provide for ready removal and replacement of the cam.

Bridging the bearing lugs 16 and 17 of the attachment frame is a sheet metal cover plate 89 formed over the bearing apertures Is and 19 with access holes 90 and 91 through which lubricant may be applied to the bearing surfaces. The cover plate 89 is held in place by a fastening screwi92 threaded into the. attachment supporting member 21 of the frame and by a fastening screw 93 passing through the bearing lug 16 and threaded into a. lug-94 struck. out from the cover plate. T he cover plate 89'is for-med with a forwardly extending arm 95 slotted so as to hold captive the thumb screws 25 by which the attachment is secured to the sewing machine. The cover plate 89 is also formed with apair of latch fingers 96 and 97- serving to hold in closed position'a hinged cover 98 which spans the upwardly open pattern cam enclosure of the attachment frame.

The frame sidewalls 26 and 27 areeachextended rearwardly ofthe transverse. rib 28 at the rear of the attachment' frame and are apertured transversely as at 99 to accommodate hinge pieces 101101 on which the cover 98. is pivotally' mounted. The cover 98 is formed with an opening 162 exposing the upstanding finger grip pordon-.103 of. theapattern cam such that whenthe cover-is. closed, only the. finger grip portion of the cam is acces-= sible outside the attachment frame. A leaf spring member 104 is secured inside the hinged cover plate and formed with two arms 165105 which bear upon the pattern cam when the cover plate is closed so as to prevent retrograde cam movement. The spring is also formed with two arms 166-196 which provide sprhig latch members cooperating with the latch fingers 96 and 97 of the cover plate 89 to hold the cover 93 in closed position. The hinged cover 98 is formed with downturned sidewalls 107 which in the closed position of the hinged cover cooperate with the upstanding sidewalls 26, 27 and 28 of the attachment frame to complete a pattern cam enclosure. The hinged cover is also formed with a protruding lip 108 which serves as a handle and facilitates opening and closing of the hinged cover plate.

Over and above the ease of assembly provided by the construction and arrangement of parts of this invention and the consequent economy of manufacture resulting therefrom, the above described construction has the added advantage of providing readily a far higher degree of accuracy in the relative location of the parts in the complete assembly. The increased precision in the arrangement of parts in the attachment of the present invention stems from the relatively close tolerance which may be readily attained with a one piece molded frame 11. Preferably the frame is made of an aluminum alloy or a magnesium alloy die casting in which the required precision of the molded frame may be easily obtained. In addition, a molded or die cast frame for its weight possesses a much higher degree of dimensional stability than can be expected from prior art attachment frames which were made by sheet metal stamping or pressing methods.

Since the frame 11 determines the location of the bearing surfaces of all of the parts of the actuating mechanisms as well as the location of all fastening screws and the like, the present construction provides a frame which may be manufactured economically to a degree of accuracy such that a random selection of parts having conventional tolerances, when assembled in the attachment frame, will occupy predetermined relative positions with sutficient accuracy to operate satisfactorily on a sewing machine without requiring additional adjustments.

Having thus set forth the nature of the invention, what I claim herein is:

l. A molded one piece frame for a pattern cam controlled work-jogging attachment for a sewing machine comprising, a flat horizontal platform formed with an elongated aperture, at least one bearing lug extending upwardly from said platform at one side of said elongated aperture, said bearing lug being formed with a transverse cylindrical bearing aperture, an attachment supporting member extending from said bearing lug and formed with a sewing machine presser bar accommodating seat, an upstanding reinforcing rib on said platform extending substantially parallel to the longitudinal axis of said elongated aperture and beyond at least one extremity thereof, said reinforcing rib having an aperture at its juncture with the platform at a point beyond the extremity of said elongated slot, and means on said platform defining a vertical axis of pattern cam turning movement.

2. A molded one piece frame for a pattern cam controlled work-jogging attachment for a sewing machine comprising, a fiat horizontal platform, at least two sidewalls extending upwardly from said platform and defining with said platform an upwardly open enclosure for a pattern cam, said platform being formed with an elongated aperture, at least one bearing lug extending upwardly from said platform at one side of said elongated aperture, said bearing lug being formed with a transverse cylindrical bearing aperture, an attachment supporting member extending from said bearing lug and formed with a presser bar accommodating seat, one of said sidewalls being formed with an aperture at its juncture with the platform, said aperture opening into said pattern cam enclosure, and means on said platform within said pattern cam enclosure defining a vertical axis of pattern cam turning movement.

3. A frame for a pattern cam controlled work-jogging attachment for a sewing machine comprising, a molded one piece member including a flat horizontal platform formed with an elongated aperture, at least one bearing lug extending upwardly from said platform at one side of said elongated aperture, said bearing lug being formed with a transverse cylindrical bearing aperture, an attachment supporting member extending from said bearing lug and formed with a presser bar accommodating seat, at least two sidewalls extending upwardly from said platform and defining with said platform an upwardly open enclosure for a pattern cam, one of said sidewalls being formed with an aperture opening into said pattern cam enclosure, means on said platform within said pattern cam enclosure defining a vertical axis of pattern cam turning movement, and a cover plate for said pattern cam enclosure, means defining a hinged connection between said cover plate and one of said sidewalls, and depending fianges formed on said cover plate and disposed to cooperate with the upwardly extending sidewalls on said platform in defining a pattern cam enclosure.

4. A frame for a pattern cam controlled work-jogging attachment for a sewing machine comprising, a molded one piece member including a fiat horizontal platform formed with an elongated aperture, a pair of bearing lugs extending upwardly from said platform one at each side of said elongated aperture, said bearing lugs being formed with axially aligned transverse cylindrical bearing apertures, an attachment supporting member extending from said bearing lugs and formed with a presser bar accommodating seat, sidewalls extending upwardly from said platform and defining with said platform an upwardly open enclosure for a pattern cam, one of said sidewalls being disposed substantially parallel with said elongated aperture in said platform and having an aperture formed therein opening into said pattern cam enclosure, means on said platform within said pattern cam enclosure defining a vertical axis of pattern cam movement, a cover plate for said pattern cam enclosure, means defining a hinged connection between said cover plate and one of said sidewalls, a shield member secured to said one piece member and spanning said bearing lugs, and interengaging-latch means carried on said shield member and on said cover plate effective to constrain said cover plate in closed position.

5. A frame structure for a pattern cam controlled work-jogging attachment for a sewing machine comprising, an integral one piece member provided with a flat base section having extending therefrom at one end an attenuated portion and at its other end a pair of opposed hinge cheeks, said attenuated portion having projecting from one face thereof spaced opposed bearing lugs formed with axially aligned transverse bearing apertures, an attachment supporting boss formed on said attenuated portion and provided with a presser-bar accommodating socket, disposed adjacent said bearing lugs, a pair of opposed sidewalls extending from the side portions of said fiat base section in the same direction as said bearing lugs and forming with said bearing lugs an open ended partial enclosure for a pattern cam, means on said fiat base and located within said pattern cam enclosure providing an axis about which the pattern cam can turn, a cover plate for said pattern cam enclosure having at least one sidewall complemental to one of the sidewalls of said fiat base section thereby to complete the'enclosure for the pattern cam, and hinge means connecting said cover plate to said hinge cheeks on said fiat base section.

References Cited in the file of this patent UNITED STATES PATENTS 

